Paper pulp extractor



Nov. 15, 1932. L VQREESE ETAL PAPER PULP EXTRACTOR File d March 2. 1951 y my? mzw m @5 5 x Patented Nov. 15, 1932 UNITED STATES PATENT OFFICE LEI'UEL V. REESE GEORGE W. JOHNSON, OF. CINCINNATI, OHIO, ASSIGNORS TO THE AMEBYICAN LAUNDRY MAGHINERY COMPANY, OF

POBATION OF OHIO Application filed Inch 2,

tractors and, particularly,'to an apparatus embodying centrifugal action for freeing paper pulp from impurities according to the specific gravity of the impurities, and delivering the paper pulp in a purified state, to the paper making machines.

Centrifugal machines of this character usually embody a rotatable basket having a solid Wall with means provided thereon for retarding the normal tendenc of the pulp to flow upwardly in order to su ject the pul to centrifugal action over such period of t1me that the impurities and pulp will be separated and a skimming ring that is employed for skimming off the lighter weight impurities forming the inner stratum of the mass within the basket, the purified pulp made up of fibres only forming the center stratum and being delivered continuously into a volute as un treated pulp is fed into the basket. It is well understood that centrifugal action divides the mass up into the heavier stratum or those parts having the greatest specific gravlty, an

intermediate stratum which is normally the purified paper pulp, and an inner stratum made up of impurities of less specific gravity than the paper pulp. In previous machines, the skimmer ring, while functioning to skim off the lighter weight impurities has embodied no means for holdin such impurities, the impurities finally over owing at the inner edge of the skimmer ring into the volute or delivery conduit to intermingle with the purified stock and flow outwardly therewith.

It is the object of our invention to provide a means for trapping the lighter weight impurities that form' the inner stratum of the layer of pulp being purified as well as a means for filtering out the im urities under centrifugal force and permitting the water intermingling with them to flow over into or be thrown outwardly by centrifugal force into the purified pulp in the volute, thus finally delivering completely purified pulp having the proper water content.

Various other objects and advantageous features will be seen in the following description and one embodiment thereof may be seen in the accompanying drawing where- CINCINNATI, OHIO, A. COB- rum PULP ax'rmoron 1981. Serial at. 519,443.

in similar characters of reference designate corresponding parts, and wherein A Fig. 1 is a view, partly in section and partly in elevation showing an apparatus constructed in accordance with our invention; Fig. 2 is a top plan view of the apparatus shown in Fig. 1 with the power.

unit and supporting means therefor removed; and Fig. 3 is a sectional view show-' ing the position taken by 'the various stratum having different specific gravities during the operation of the apparatus and the delivery of the purified stratum to the volute. I

Referring to the drawing, we have shown a' centrifugal extractor consisting of the usual curb 1 supported by suitable base members 2 and adapted to receive a rotatable basket 3 mounted on a spindle 4 that ro-' tates in a bearing5 carried by the curb 1 and has its opposing end attached to the drive shaft 6 of the suitable motor or powermeans 7. As shown, this motor or power means is pivotally mounted in a pivoted gimble ring 8 supported by suitable uprights 9 which will permit precession of the spindle during 7 operation of the apparatus.

As .is customary in such apparatus, suitable circumferential bafile flanges 10 are disposed within the basket 3 for the purpose of retarding the upward flow of pulp and also for building up a pulp mat into which the heavy impurities extracted from the pulp during the centrifugal operation of the basket will be 'imbedded and thereby retained in the basket. The top of the basket is provided with an annular ring 11 having an overhanging portion 12 adapted to retain the pulp mat andheavier impurities and prevent their fiow out of the basket and an overhanging portion 13 that acts as a guide for directing the extracted paper pulpinto a volute 14 and as a means for preventing the paper pulp from falling downwardlybetween the 7 the passage of clarified. liquid therethrough and over into the volute 14, the liquid being separated and thrown outwardly by centrifugal action. The curb 1 is shown as being provided with 'a suitable cover 17 although this is not absolutely essential.

In the operation of the apparatus, wood pulp from the usual heaters is fed into the basket 3 through a pipe 18 which hasits outlet openin near the bottom of the basket. Then, the basket is rotated at aspeed which will produce a centrifugal force effective on impurities heavier than the weight of the fiber in the pulp to cause them to be imbedded in a mat of fiber formed on the inner periphery of the basket wall and between the circumferential flanges 10 as shown at 19 in Fig. 3 while a stratum of purified fiber will form adjacent the mat of fiber containing the heavier impurities as shown at 20, this stratum of fiber tending to move upwardly as the pulp is fed into the basket. Speed of rotation of the basket is such that the impurities of the lighter weight than that of the paper pulp fibers are unaffected by the centrifugal action to the extent that they will rise by the action-of flotation and with the stratum of pulp fibers 20,- as untreated pulp isfed into the basket forming an inner stratum that is skimmed off by the skimming ring 15 and pushed upwardly on the surface of the screen or filter 16. The centrifugal action will be effective on the lighter impurities to separate the water therefrom and,

throw the water outwardly into the volute 14 into which the stratum 20 of the puri-j fied paper pulp fiber passes. Thus, a means is provided for purifyin the paper pulp by removing both the heavier and the lighter impurities therefrom by centrifugal action, while, at the same time, not forever alienating the normal water content from the pulp whereby the purified pulp will be delivered from the delivery end 22 of'the volute 14 with the proper water content. This is a highly advantageous and very desirable I feature.

What we claim is: 1. Apparatus of the class described, comprising a rotatable basket wherein material is subjected to centrifugal action for separating the material into di parts of the material, means for delivering one stratum from the basket, and means for segregating another stratum of the material, extracting liquid from said segregating stratum, and delivering such liquid to the stratum delivered from the basket.

erent strata in accord ance with the specific gravity of the different 2. Apparatus of the class described, comprising a casing, a basket mounted for rotation within said casing, means for rotating said basket, means for delivering material thereto for treatment by centrifugal action whereby the material Wlll be separated into strata according'to the specific gravity of the parts thereofi means for delivering one said basket, means for delivering material.

thereto for treatment b centrifugal action whegebythe material will be separated into strata according to the s ecific gravity of the parts thereof, means or delivering one stratum from said basket and intoa volute, a skimming ring for separating stratum of lesser specific gravity from the delivered stratum prior to delivery thereof, and strainer means for retaining said last named strata within said basket whereby liquid may be extracted therefrom by the centrifugal action of said basket and delivered to the delivered stratum.

4. Apparatus of the class described, comprising a casing, a basket mounted for rotation within said casing, means for rotating said basket, means for delivering material thereto fortreatment by centrifugal action whereby the material will be separated into strata according to the specific gravity of the .parts thereof, means on said basket for retarding the upward flow of the material and trapping the stratum having the greatest specific gravity, means for delivering an intermeditae stratum out of said basket, means for separating a stratum of lesser specific gravity than said last named stratum prior to delivery of the said stratum from the basket and segregating such lighter stratum from said delivered stratum, and means for extracting liquid from said segregated lighter stratum and delivering it to the stratum delivered from said basket.

In testimony whereof we hereby aflix our signatures.

LEMUEL V. REESE. GEORGE W. JOHNSON; 

